The problem is that they've been convinced the reason everything in our lives is increasingly shitty is down to hordes of 6-year-olds with leukemia who've crossed the border for free medical care. It couldn't be more obvious that this is a scapegoating operation being pushed by the ultra-wealthy who are gaining from widening precarity and exploitation. But a "solution" that involves just inflicting a bunch of harm to the powerless is inherently more appealing than wresting control from the powerful, which will involve real work & sacrifice.